Imagine being part of a vibrant community acting together on environmental issues at the neighbourhood, town, or city level. That’s exactly what Citizen Observatories (COs) are all about! COs are community-based environmental monitoring initiatives that bring people together to collect data and insights that can make a real difference right where they live by informing policy or citizen-led actions to address issues like air pollution, noise, and urban heat. COs acting at the local level are also contributing to broader national and global environmental efforts.